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| author | Shawn Zhang <shawnzhang009@gmail.com> | 2016-03-15 11:42:20 +0800 |
|---|---|---|
| committer | Shawn Zhang <shawnzhang009@gmail.com> | 2016-03-15 11:42:20 +0800 |
| commit | b38a7645366b1580b5f554303e411447c7d2d09d (patch) | |
| tree | cfe5c9e59fa1f3611a5b5545f9b2d74cbac461f2 /swift.html.markdown | |
| parent | 072424afd77b9d772102f83508fcc337ffc81a7d (diff) | |
| parent | fbe11b52d5fe839f791935012b93ff8ef2ac91f6 (diff) | |
Merge remote-tracking branch 'upstream/master'
Diffstat (limited to 'swift.html.markdown')
| -rw-r--r-- | swift.html.markdown | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/swift.html.markdown b/swift.html.markdown index 46768375..e921e7ea 100644 --- a/swift.html.markdown +++ b/swift.html.markdown @@ -94,6 +94,8 @@ var unwrappedString: String! = "Value is expected." // same as above, but ! is a postfix operator (more syntax candy) var unwrappedString2: ImplicitlyUnwrappedOptional<String> = "Value is expected." +// If let structure - +// If let is a special structure in Swift that allows you to check if an Optional rhs holds a value, and in case it does - unwraps and assigns it to the lhs. if let someOptionalStringConstant = someOptionalString { // has `Some` value, non-nil if !someOptionalStringConstant.hasPrefix("ok") { |